The effect of increasing the maximum allowed number of tiles when applying the “allow clients to export cache tiles”

I couldn’t figure out what is the effect of increasing the maximum allowed number of tiles when applying the “allow clients to export cache tiles” in the ArcGIS server advanced cache settings. for example, what may happen to the service and server if the maximum allowed number of tile increased from 150,000 to 1,000,000?Please see the screenshot below